Method and system for controlling the output of an engine driven

Details Method and system for controlling the output of an engine driven Method and system for controlling the output of an engine driven

1995-08-31

1997-09-23

Shaw, Clifford C.

Electric heating

Metal heating

By arc

219133, B23K 9095

Patent

active

056700709

ABSTRACT:
A method and system of controlling the output current/voltage characteristic curve of an engine driven alternator welder with a maximum open circuit output voltage, including a rotary engine, a three phase alternator, a rectifier bridge having a number of electronic switching devices for directing current to the output at an operating point determined by the firing angle of the switching devices, a sensor for sensing output current, a sensor for sensing output voltage, and a microprocessor output control device for controlling the firing angles of said switching devices in response to the sensed current and sensed voltage. The method and system comprise a device for creating a desired fixed slope operating current/voltage characteristic curve; an arrangement for sensing the present operating current/voltage point of the welder; and, a control for changing the firing angles of the switching devices to shift the current operating point to a new operating point on the desired, fixed slope current/voltage curve of the welder. Preferably, the switching devices include an SCR for each phase of the alternator.

REFERENCES:
patent: 3549979 (1970-12-01), Stearns et al.
patent: 3912980 (1975-10-01), Crump et al.
patent: 4608482 (1986-08-01), Cox et al.
patent: 5408067 (1995-04-01), Crouse
patent: 5444214 (1995-08-01), Crouse et al.

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